Another possibility could revolve around Ford UK. Yes, I know, it's a subsidiary of an American company, but Ford UK was (and still is) more or less different from Ford North America. Back in the 1970's, Ford UK's lineup had the Fiesta, Escort, Cortina (Taunus in Continental Europe), Granada, and the Capri.
However, by this time the lineups of the various European countries were starting to consolidate themselves, and thus with this harmonization, the unique lineups that each country had were no more. So no more models like the Ford Consul or Ford Anglia would be produced. Dagenham would eventually, in OTL, build the Escort, and then reduce itself to just an engine plant.
However, let's try something different here, a British compact car that would replace the Escort. Designed and built in Britain.
I have an idea!
In Japan, Mazda was building a car called the Familia (known also as the 323, the Etude in South Africa, and in North America as the Protegé). It is known especially among petrolheads in North America for its spirited handling. I don't know what the reputation of the 323 was in Europe (other than that it was Japanese). Starting around the 1970s, American manufacturers decided to import Japanese cars to get a "small car" in their lineup for the most part (i.e. Chrysler and Mitsubishi, GM and Suzuki, Ford and Mazda, etc.) So what if this idea was transplanted to the UK BUT with some modifications? That is the basis of this idea.
Here, the butterfly is somewhere around the 1970s, say around 1977-1979.
Say some Ford UK engineers decide to take a trip to the Mazda factory in Hiroshima. They see the fourth-generation Familia being built, and they fall in love. However, the engineers knew that if it was found out that Ford UK was building a badge-engineered Japanese car (i.e. like the Ford Laser in the Asia-Pacific region) then a lot of people, especially politicans, would be angry. So what happens is that Ford UK and Mazda collaborate on replacements for the Escort (for Ford) and the fourth-generation Familia (for Mazda), designing and testing it mainly in the UK (but also with some testing in Japan). The new model would retain the Familia name with Mazda, but Ford UK would revert to the Anglia name with this one. The target date for relase would be in 1980.
The new model would exhibit some of the radicalness of the Ford Sierra, which would be built two years later. On the inside, Mazda and Ford engineers designed new engines just for this car. This new engine series, known as "Zetec" (originally called Zeta but the name changed at the last minute to avoid being sued by Lancia), would replace Ford's metric engine (aka the one found in the Pinto) and Mazda's engine family for the Familia. A departure from previous Ford engines was that it was modular, so that it Ford UK wanted to, Zetec engines could be shortened to fit into the Fiesta, or legnthened to fit in the Cortina. This was a radical departure from how engines had been done previously, and it was one Ford UK and Mazda was willing to exploit.
The only difference was the exterior and interior. Mazda still used its own designers for designing the exterior and interior (though everything else was the same), and Ford wanted to test the public's reaction with a new style of design before the release of the Sierra, using Ghia designers. Ford used the following trim lineup for the Anglia:
Popular
Bonus
L
DL
GL
Ghia
Zetec
"Zetec" was Ford's answer to the Volkswagen Golf GTI. Eventually, Ford-Werke AG found out about Ford UK's project and wanted to jump on board. Thus, Ford built RHD versions of the Anglia and LHD versions (still known as the Escort) for Continental Europe. Ford USA wanted to build a version for North America. Government regulation and separate engineering organizations initially made it impratical, but Ford found a way around it by sending copies of the blueprints to North America, including that of the new Zetec engine. The only difference between the North American Escort and the European Escort was that the engines were slightly modified to comply with California and EPA regulations, and Ford USA's Special Vehicle Operations, with the help of Ford UK, found a way of making a "mini-Mustang" out of the Escort.
First, some of the components of the Fox platform were used in the Escort. This included the front and rear suspension. Then, Ford USA decided to try to tweak the Zetec engine using the knowhow they had gained from the Mustang engines, especially the BOSS 302 engine, and managed to get even-more powerful versions of the Zetec engine then what was initially expected. The interior was also modified to give it a sporty appearance. In North America, this variant became known as the EXP and built in North America. Generally, though, North American Escorts were still primarily conservative in design, though the European interior remained intact. It was primarily built in Oakville, Ontario with a 3-door, 5-door, and wagon model being offered. Thus, they looked like in OTL:
A mid-life refreshment brought the styling in line with it's European counterpart.
As mentioned before, the Anglia and the third-generation European Escorts were built in the UK, and looked similar to the Ford Sierra that would follow two years later. The "American" version was also built in the UK, called the Zetec. Ford UK slightly modified the Zetec to suit British regulations and also introduced turbocharging onto the Zetec engine. The EXP/RS used a 2.0L turbocharged engine, whilst the "American" 1.9L engine was also standard on the Ghia yet optional for the other trim levels. The other engines were those designed jointly by Ford UK and Mazda, in 1.1L, 1.3L, and 1.6L configurations. From the outset, it was offered as a saloon, estate car, estate van, and also in 3-door and 5-door configurations. Eventually, a cabrio version was offered by Karmann through a joint-venture (and built in a brand-new facility in Solihull), and imported in limited numbers to North America.
Picture of the Sierra:
The Mazda version was similar to OTL, so no big changes there.
So, the new Anglia/Familia was released in 1980, with the Ford version built in Dagenham and the Mazda version in Hiroshima. Initially, it didn't sell very well, which sent a signal to Ford that for the Sierra, the design should be toned down a bit. However, the Anglia/Escort Zetec proved to be a huge seller for Ford, with many car magazines favourably comparing it to the GTI. Ford USA also saw some big sales for the Escort EXP. Thus, the Anglia managed to survive to 1985. In 1985, the Anglia and Familia were given a mid-life refreshment, including ABS, 4-wheel disc brakes and the invention of ESP, co-invented with Bosch. ESP was initially avaliable on the Ghia and the Zetec (which was now equipped with permanent 4WD), but by 1987 it was avaliable throughout the entire Anglia lineup. Ford toned down the Anglia design a bit to match it with the Sierra. The refreshed version lasted until 1990. As before, the Anglia/Escort was built in Dagenham.
To be continued, . . .